Your plan is sounding better now that I know what you mean by a BIG container. They do need excellent drainage or you can have trouble with root rot. Again, just don't crowd the roots when planting and keep them fed and damp when they're small. Google some instructions about planting, because you need to cover them shallowly at first and then keep filling in the dirt as they grow during the first season. Weeds will be the death of them...I learned that by planting red raspberries too close to my first asparagus bed.
